 <style>
 @media (min-width: 576px){
	.modal-dialog {
	    max-width: 800px;
	}
}
</style> 
 <div class="modal fade" id="selPostModel" tabindex="-1" role="dialog" aria-labelledby="exampleModalGridTitle" aria-hidden="true">
                  <div class="modal-dialog modal-dialog-centered" role="document">
                    <div class="modal-content">
                      <div class="modal-header">
                        <h6 class="modal-title" id="exampleModalGridTitle">选择商品/文章</h6>
                        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                          <span aria-hidden="true">&times;</span>
                        </button>
                      </div>
                      <div class="modal-body">
	                      <div class="table-responsive">  
				             <table class="table text-nowrap" id="selTable"></table>
				          </div>
                      </div>
                      <div class="modal-footer">
                        <button type="button" class="btn btn-secondary btn-close">关闭</button>
                        <button type="button" class="btn btn-primary"  name="save" id="selSaveBtn">保存</button>
                        <button class="btn-hide"></button>
                      </div>
                    </div>
                  </div>
                </div>